Pitman-head



-(No Model.)

P.. SAWBNSON. PIT-MAN HEAD. 11.0. 517,177.

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'pounding action on the Nirep STATES PATENT Fries.

PITNIAN-H EAD.

SPECIFICATION forming part of Letters Patent No. 517,177, dated Maroh 27. 1894- Applicaton filed November 13, 1893. Serial No. 490,790. (No model.)

To all whom t may concern:

Be it known that I, PAUL SWENSON, a citizen of theUnited States, residing at Minneapolis, 1n the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Pitman-Heads; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which 1t appertains to make and use the same.

My invention is in the nature of an improvement in pitman-heads. By experience, 1t has become a determined fact, that, for use on machinery which is to be subjected to severe or rough usage, such as agricultural mach1nery,m1ning machinery, hoisting machinery, duc., pitmen having Wooden boxes, give the best results, to-Wit: small wearing friction on the pitman pin or crank, the least parts, and cheapness of construction.

With these facts in View,it is the object of my lnvention to provide an improved form of pitman head, especially adapted for wooden bearings, which will be simple and cheap in construction and strong, durable and efficientin operation.

To these ends, my invention consists of thel novel features of construction hereinafter fully described and defined in the claims.

The preferred form of my invention is illustrated in the accompanying drawings, where- 1n,l1ke letters referring to like parts throughout the several views- Figure l is a side elevation of the pitman head anda portion of the pitman rod. Fig. 2 1s a plan view of the same, and Fig. 3 is a vertical longitudinal section taken on the line X X of Fig. 2.

A represents a portion of a pitman-rod.

a b are the wooden half box-sections of the pitman-head formed, respectively, with semibearing seats ct and b. Of these half-boxes the section a is, as shown, formed integral wlth the pitman rod proper A, while the section b is in the form of a loose block. The semi-seats a and b', are each somewhat less than a semi-circle in extent, for the purpose of permitting an adjustment of these half boxsections, as will presently appear. The boxsections are adj ustably held Vtogether by a a, by nutted bolts c', and provided at their f outer ends each with a perforated bolt lug c2 and a pair of keeper-lugs c3. It should here be noted, that the outer ends of these joint box-section d, to embrace and form a partial guide or keeper for the box section b.

d is a cap-like joint-iron, bearing against the outer end of the box-section b, provided with a pair of perforated bolt-lugs d and having a pair of side flanges b2 embracing the side faces of said loose box-sections b, and Working between the pairs of keeper-lugs c3 on the extended ends of the bolt-irons c. The above set forth engagement between the jointirons, gives a telescoping adjustment of the parts and serves to keep the box-sections a, b longitudinally in line. .Y

f is a pair of bolts, provided, (as shown) with double or jam nuts f', working one .through each of the bolt-lugs c2 on the jointirons c and the bolt-lugsd on the cap-like iron d. It should be here noted, that the bolts f are spaced away from the edge faces of the box-section b, thus forming between the same, and the opposing ends of the respective strapirons c and the cap-iron d .keeperlike seats. In these keeper-like seats are interposed resistance pieces, as shown and preferred in the form of strips or blocks of soft wood, indicated at g. This strip constitutes a yielding resistance device, which reacts against and opposes the drawing or clamping action of the bolts f. To prevent any angular movement longitudinally of the bearing surfaces a and b', the opposing ends of the strap-irons c and the cap-piece d are arranged parallel, the resistance-strip g is formed with parallel longitudinal edges, and the draw-bolts f are positioned centrally of said strapirons c.

The use and operation of the device are obvious. In placing the pitman-head in working position on the pitman-pin or shaft, the box section b may be entirely. removed, if the nature of the pin or shaft requires it by irons c project outward beyond the end of thev IOO removing the nuts f and withdrawing the cap-piece d. In adjusting the head to the pitman-pin or shaft, the nuts f are tightened, drawing the cap-piece d and the boxsectlon b toward the box-section a and compressing or crushing the resistance-strips g between the joint irons. As the bearing surfaces or seat portions a and b' Wear away, under their work, the box-sections` may, by still further tightening the nuts f on the bolts f, be drawn together to compensate for or to take up the slack or lost motion produced by said wear. Under this action, the wooden resistance strips g will, ot' course, be furthercom pressed. A considerable movement, as above described, is permitted in virtue of the fact that the bearing surfaces or seat-portions a and b are less than a semi- `circle. Vhen, however, the outer edges of said seat portions, will, under this movement for taking up the slack, be brought into engagement, they may of course, becut away so as to permit the `further adjustment of the box-sections, and, hence, to prolong the life `of the same. 4As is evident, the cap-like jointiron d will be firmly held wherever set, by the clamping action of the clamping bolts and the opposing action of the resistance pieces or strips g.

It is obviousythat various alterations in the details of construction of this pitman head, `may be made Without departing from the spirit of my invention. For instance, the resistance device, while described `and preverred, as formed of wooden strips, might be formed of various other solid and compressible material, such -as rubber or leather; or even stiE metallic springs might beemployed.

Again, the box-sections might be constructed of metal, and `formed integral With the parts corresponding to the pieces herein called joint-irons. V

What I claim, `and desire to secure by Letters Patent of the United States, is as follows:

l. A pitman-head, comprising wooden-half- `box sections, one of which is formed integralv withlthepitman-rod and the other of which 1s loose, and-a clamping device, consistingof -a pair of joint irons secured to the rod member of the box-sections, provided with bolt lugs and having their ends projecting to form a partial guide and keeper for the loose boxsection, a cap-like joint-iron working against the outer end of the loose box-section and having a pair of bolt-lugs, and nutted clamping bolts working through said bolt-lugs on said joint-irons, for drawing the parts together, substantially as described.

2. A pitman-head, comprising Wooden box- Sections, one of which is formed integral with the pitman-rod and the other of which is loose, the pair of strap-like joint irons, secured to the rod member-of the box-sections, provided with bolt-lugs and having their ends projecting to form a partial keeper and guide for the loose boX section, a cap-like `joint iron workingfagainst the outer `end `of the loosebox section and having a pair of bolt-lugs, `nutted clamping bolts working through said bolt lugs on said joint irons, and a pair of wooden resistance `strips interposed one between each of the strap-like joint-irons `and the cap-like joint iron, substantially as and for the purpose set forth.

3. A pitman-head, comprising the wooden half-box sections a and @having respectively, the semi-bearing seats u' and b', `the strap like joint irons c secured to said box section a with their ends projecting `and `embracing the box-section b to form a partial keeper-or guide for the saine, said joint-ironsc being provided with the bolt-lngsc2 and the keeperlugs o3, the cap-like `joint-irons CZ `havingboltlugs d', and the side iianges d2'embracing said box-section b and Working between the keeper-lugs cS on said joint-irons c, the nutted draw-bolts ff working through said bolt lugs c2 and d', and the wooden resistance strips ginterposed in `the seats formed between said joint-irons c and CZ, the lboltsf and the box-section b, substantially as described.

In testimony whereof Iaiiix mysignature in presence of two witnesses.

PAUL SWENSON.

Vtitnesses:

FRANK D. MERCHANT, A. I-I. OPSAHL. 

